The O-Ring, cataloged under National Stock Number 5331-01-528-1423, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-528-1423 |
| Primary Part Number | 803-4384536-21B1-49 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 803-4384536-21B1-49 PRIMARY | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 803-4384536-21B1-49 | 5/2 Secondary reference U.S. Government activity |
NSN 5331-01-528-1423 is a O-Ring, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-528-1423 has 1 manufacturer part number on file: 803-4384536-21B1-49 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).
Key specifications for 803-4384536-21B1-49: Special Features: UNION END COUPLING SEAL, 0.375 GLOBE STOP CHECK VALVE 4820-01-154-6275; Part Name Assigned by Controlling Agency: O-RING UNION; End Item Identification: AIR REMOVAL ASSEMBLY 3257048 F100CL(10001); ELEK EQPT WATER COOLER HD-1077/SSQ DDG91&UP; AIR REMOVAL ASSEMBLY 3257048 DDG91&UP (10001); ELEK EQPT WATER COOLER HD-1157/SPY DDG91&UP. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.